Necticut



(No Model.) 2 G. H. ALTON & W. 0. WAKEFIELD. OOMMUTATOR FOR DYNAMOS, MOTORS, &o.

No. 421,222. Patented Feb, 11; 1890.

m J16 l J MWIW W "W UNITED STATES PATENT OFFICE.

GEORGE H. ALTON AND WILLIAM 0. WAKEFIELD, or LYNN, MASSACHUSETTS,

ASSIGNORS To THE THOMSON-HOUSTON ELECTRIC COMPANY, or CON- NECTICU I COMMUTATOR FOR DYNAMOS, MOTORS, 800.

SPECIFICATION forming part of Letters Patent No. 421,222, dated February 11. 1890.

Application filed March 8, 1889. Serial No. 302,540. (No model.)

To all whom it may concern: J. One end of the commutator-shell A is so Be it known that we, GEORGE H. ALTON constructed as to grasp the V-shaped segment and \VILLIAM O. \VAKEFIELD, citizens of the on its upper or outer face or bevel, as shown, United States, and residents of Lynn,in the the corresponding outer bevel or incline at county of Essex and State of Massachusetts, the opposite end being grasped or clamped by have invented a certain new and useful Coma ring or clamping-piece I), having a bevel mutator for Dynamo-Electric Generators, Mosuch as shown and mounted on the shell A, tors, &c.,of which the following is a specificasurrounding the armature-shaft or on any tion. other suitable support. The cap or clamping IO Our invention relates to the form of the piece B maybe forced toward the segment by commutatorsegments and the manner of sea nut E upon the cylindrical portion of the curing the same in position, the object being shell A or upon other suitable bearing. The to hold them firmly against displacement, usual set-nut for holding nut E is indicated while at the same time permitting their ready at F. lhe inner sides of the two bevels are 15 removal when worn or damaged and the sub grasped or clamped in seats or bearings O D, o 5 stitution of new parts or segments. properly shaped to receive the bevels or iii- A further object of the invention is to proclines on the segment, and provided with invide a thorough insulation of the segments dependent devices for fastening or forcing from the shell or parts supporting them and them together with the segment between them.

20 from one another, so as to reduce the liability C D indicate two rings mounted and movto short circuits or grounds to a minimum. able on the commutator-shell or other suitable Ourinvention consists in providing the comsupport, and I indicates a suitable screw or mutator segments or strips at their ends with bolt adapted to force the two rings G D toboth an outer and an innerbevel, thus giving ward each other, thus firmlybindingthe com- 2 5 the end of the segmentor strip a V shape mutator-segments between them. The seg when the bevels or inclines are at such an anments are thoroughly insulated at their ends gle as to intersect or meet at the end. We do and at their inner sides from one another and not limit ourselves to the exact V form, as the from the shell and supports by sheets or strips bevel might be such as to leave the end of mmofinsulating 1naterial--such,forinstance,

0 the segment blunt instead of pointed or of a as llllGt tllSPOSGtlflLS shown,on thebevel or ta- V shape. per surfaces of the seg1nent,where it is firmly Our invention consists, further, in clamping held between the segments and the clampingthe segments by devices adapted to grasp and seats, and by another sheet of insulation n, clamp the outer and inner bevels of the ends which is sustained, as shown, between the in- 5 independently, in a manner which will more wardly-inclining pieces m, and close up to the 8 5 clearlyappear from the following description. inner surfaces of the segments out of contact Our invention consists, also, in certain tie with the shell. or cylinder A. tails of construction and combinations of It is evident that, as shown in Fig. 2, instead parts to be hereinafter described and more of having rings 0 I) both movable and ar- 40 particularly claimed. ranged to be forced toward each other by the In the accompanying drawings, Figure 1 is screw 1, either one might be stationary and a longitudinal section of a commutator emmight form a part of the shell A or the cap bodying our invention. Fig. 2 illustrates a B, and the other movable, the movable poi modification. tion being made to be forced toward the 5 Referring to Fig.1, His a copper segment stationary portion by screws extending 5 V shaped at both ends and having a projecthrough the shell A, as indicated at N, or by tion extending upward, to which the leading other devices. The method first described is, wires from the armature-coils may be connecthowever, our preferred construction, since ed in any suitble manner, as by soldering in both rings 0 D are adj ustable laterally with 50 a piece G, attached to the segment H by screws respect to the shell A. It is also evident that I00 the shell A might be made in two pieces instead of one, the end or portion which receives the segment ends being secured to the cylindrical portion at the dotted line (Z.

What we claim as our invention is- 1. In a commutator, a segment or plate having a double bevel at its end, in combination with independent clamping seats or bearings engaging, respectively, with the two inclines of said bevel.

2. In a commutator, the combination, with the segments or plates having an inner and outer bevel at each end, of independent clamping seats or supports for the inner and outer bevels, respectively, as and for the purpose described.

3. The combinatiomwith the segments having V-shaped ends, of clamping devices for the outer inclines or bevels, and clamping seats or supports grasping the inner bevels or inclines and adapted to be forced toward one another by clamping devices independent of those for the outer inclines or bevels.

-l-. In a commutator, the combination, with the segments havingV-shaped ends, of a eo1nmutator-shell having a clamping-seat for the outer bevel at one end, a cap for the correspondin g bevel at the other end, and two independent internal clamping-rings adapted to engage the inner bevels or inclines, as and for the purpose described.

5. The combination, with the segments having V-shaped ends, of the insulating-strips m, secured between the bevels or inclines and the clampin -seats, and an interior strip of insulation sustained between the inwardlyinclined strips m, substantially as described.

6. The combination, with the commutatorsegments having an inner and outer bevel at their ends, of a clampingseat grasping the outer bevel, and a separate clamp C, adapted to grasp the inner bevel at the same end.

Signed at Lynn, in the county of Essex and State of Massachusetts, this 5th day of March, A. D. 1880.

GEORGE ll. ALTON WILLIAM O. \VAKEFIE'LD. \Vitncsses:

J. W. GIBnoNEY, WM. J. HALL. 

